I have a Dell Studio 15 laptop with an Intel High Definition Audio 2.0 sound card under which I am running Fedora 9 and Gnome 2.14 under kernel revision 2.6.26. All my packages are up-to-date. lspci lists my audio device as "ATI Technologies Inc RV620 Audio device [Radeon HD 34xx Series]", although I otherwise don't know. Per startup session, sound will not play from either my headphone jacks (both) or my speakers.
I booted with different settings in gnome-sound-properties, but which device works under what settings seems almost arbitrary. It also doesn't seem to be affected by whether my headphones are plugged in at startup. SELinux and gnome-system-log report no errors. The issue seems indiscriminate of whether I use ALSA, PulseAudio, or OSS. I used the Windows Vista disc included with my laptop; my headphones and speakers both worked fine under it.
I've been experimenting with this issue for weeks. Does anyone have any advice (or a solution)?